Container closure for a beverage can

Abstract

A container closing device for a beverage can having an opening tab which is disposed on a can lid and pivotable about a pivot reception formed in a lid bottom, the opening tab being provided with a reactive surface on its underside facing the lid bottom for contact with a liquid pouring from the pouring opening, a sealed space being realized in the area of the reactive surface and a closing piece disposed in the lid bottom between a pouring protrusion and the lid bottom so that the reactive surface is disposed at least partially in the sealed space and is sealed against the environment.

The invention claimed is: 
     
       1. A container closing device for a beverage can having an opening tab which is disposed on a can lid, is pivotable about a pivot reception formed in a lid bottom and comprises a push opener on one side of a pivot axis received in the pivot reception and an actuating end on an opposite side of the pivot axis for handling, the lid bottom comprising a closing piece, which is divided from the surrounding lid bottom via a rupture inducing score, below the push opener in such a manner that the closing piece is pressurized via the push opener as a result of a pivoting movement of the opening tab and is detached from the connection to the surrounding lid bottom along the rupture inducing score for releasing a pouring opening, the container closing device having a pouring protrusion which is disposed on the same side of the pivot axis as the push opener, covers the closing piece and comprises a support end for supporting the pouring protrusion at the lid bottom during the pivoting movement of the opening tab, the opening tab being provided with a reactive surface on its underside facing the lid bottom for contact with a liquid pouring from the pouring opening, a sealed space being realized in the area of the reactive surface and the closing piece between the pouring protrusion and the lid bottom so that the reactive surface is disposed at least partially in the sealed space and is sealed against an environment. 
     
     
       2. The container closing device according to  claim 1 , wherein an elastic sealing device is provided for sealing the sealed space between the pouring protrusion and the lid bottom. 
     
     
       3. The container closing device according to  claim 1 , wherein the rupture inducing score realized in the lid bottom is disposed entirely in the sealed space. 
     
     
       4. The container closing device according to  claim 1 , wherein the reactive surface realized on the underside of the pouring protrusion is disposed entirely in the sealed space. 
     
     
       5. The container closing device according to  claim 1 , wherein the sealing device comprises sealing receptions which are disposed in the lid bottom and/or on the underside of the pouring protrusion and serve to receive a seal. 
     
     
       6. The container closing device according to  claim 5 , wherein the sealing receptions are at least partially realized as receiving beads realized in the underside of the pouring protrusion and/or in the lid bottom. 
     
     
       7. The container closing device according to  claim 1 , wherein the support end of the pouring protrusion is realized as a rim web which is supported at the lid bottom having the seal sandwiched therebetween. 
     
     
       8. The container closing device according to  claim 7 , wherein the sealing device has a lid-bottom seal and a pouring-protrusion seal, a radially outer bead section, which extends parallel to the rim web of the pouring protrusion and extends in the circumferential direction of the lid bottom, and two bead sections, which are directed inward and each extend transversally to the circumference from the ends of the radially outer bead section, being provided for realizing the lid-bottom seal in the lid bottom, a radially inner bead section being realized in the underside of the pouring protrusion for realizing the pouring-protrusion seal, the radially inner bead section extending between free end areas of the bead sections, which are directed inward and realized in the lid bottom, in such a manner that a seal, which is disposed in the radially inner bead section of the pouring protrusion, covers axial sealing ends of the seal disposed in the bead sections of the lid-bottom seal, which are directed inward, with axial sealing ends. 
     
     
       9. The container closing device according to  claim 7 , wherein the sealing device is realized as a sealing frame disposed at the lid bottom and having a circumferential bead in the lid bottom. 
     
     
       10. The container closing device according to  claim 1 , wherein the support end of the pouring protrusion is realized as a rim web which is supported at the lid bottom adjacent to the seal disposed on the underside of the pouring protrusion. 
     
     
       11. The container closing device according to  claim 10 , wherein the sealing device is realized as a sealing frame disposed in the pouring protrusion and having a circumferential bead in the underside of the pouring protrusion. 
     
     
       12. The container closing device according to  claim 1 , wherein the reactive surface is provided with a surface for encouraging bubble nucleation and bubble growth in a liquid which is received in the beverage can and contains oversaturated nitrogen or a gas mixture comprising dissolved nitrogen. 
     
     
       13. The container closing device according to  claim 1 , wherein the reactive surface is provided with an anodically produced aluminum oxide coating of a partial area of the underside of the pouring protrusion. 
     
     
       14. A beverage can having a container closing device according to  claim 1 .